"…The rotating mass of the standard kit drivetrain parts is quite high so it was interesting to compare with the conversion alloy parts. The alloy options were a tighter fit all roundand with less weight, there will besome improvement in efficiency as well as in addition to the ‘bling’ look!…All of the location points for axle pins and shafts are bushed and spacers make for a very close tolerance on the important areas. The C-clips retain them which is a big improvement over the standard self tapping pins which can pull out with repeated maintenance or repair." by RC Racer